Предмет: Алгебра, автор: andrewkoriagin38

Допоможіть будь ласка…………..

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Автор ответа: сок111213

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а² + 2ab + b² = (a + b)²

${x}^{2} + 2x + 6 = {x}^{2} + 2 \times 1 \times x + 1 {}^{2} + 5 = \\ = (x + 1) {}^{2} + 5$

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